Cranking device for internal-combustion engines.



C. A. BARTLOG. CRANKIN G DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 27, 1913.

Patented May 12, 1914,

Witness \IOLUMBIA PLANounAnH c0 UNITED STATES PATENT OFFICE.

CHARLES A. BAR'ILOG, OE MILWAUKEE, WISCONSIN.

CRANKING DEVICE FOR INTERNAL-COMBUSTION ENGINES.

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T 0 all whom it may concern Be it known that I, CHARLES A. BARTLOG, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of IVisconsin, have invented certain new and useful Improvements in Cranking Devices for Internal-Combustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention comprehends improvements in cranking devices for internal combustion engines and relates more particularly to an improvement on the structure shown in my application Serial No. 752,512

allowed July 8th, 1913.

The primary object of the invention is to provide a means for positively locking the starting shaft against rotation relative to the operating member when the parts are being positioned preparatory to the cranking operation.

With these and other objects in View as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as will be hereinafter fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in Which- Figure 1 is a longitudinal sectional view through my improved cranking device, parts thereof being shown in elevation, Fig. 2 is a fragmentary side elevation of the inner side of the stationary casing, the end of the starting shaft being also shown, Fig. 3 is a fragmentary sectional view showing a slightly modified form of the cranking device, and Fig. 1 is a fragmentary side elevation looking against the inside of the stationary casing shown in Fig. 8.

Referring in detail to the drawings by numerals, 1 designates the engine shaft, 2 the longitudinal movable and rotatable starting shaft which carries, rigidly secured to its outer end, a cam 3 having a cam face 4. The starting shaft passes through a station ary casing, generally designated 5, which in cludes a circular inner wall 6, a peripheral wall 7 formed integrally therewith and a cover plate 8. The inner wall 6 is formed with a central opening 9 through which the Specification of Letters Patent.

Application filed August 2'7, 1913.

Patented May 12, 1914.

Serial No. 786,938.

starting shaft entends. A ratchet wheel, generally designated 10, having a hub portion 11, is mounted within the casing 5, the cover 8 being centrally apertured, as indicated by the numeral 12, to engage the periphery of the hub, the inner wall 6 being provided with an annular bearing flange 13 to assist in supporting the ratchet wheel by engaging the other end of the hub thereof. A pawl 14 holds the ratchet wheel against rotation in one direction.

An operating member 15 is rotatably mounted upon the starting shaft and carries a slidable block 16 for engagement with a lug 17 rigid to the starting shaft, whereby said shaft is rotated. A pin 18 is rigidly secured to the hub of the ratchet wheel 11 and projects laterally therefrom through an opening 19 formed in the operating memher, and is adapted to be engaged by the cam face 4. The foregoing parts of my improved cranking device, with the exception of the stationary casing 5, are fully described in my allowed application Serial #752,512, and no claim thereto is made in this application.

WVhen the engine is to be cranked, the starting shaft 2 is forced inwardly by pressure upon the crank handle 20 into engagement with the starting shaft and then the operating member 15 is rotated, causing the starting shaft to rotate and this in turn r0- tates the engine shaft. In case of back firing, the ratchet wheel holds the pin 18 against movement, and the starting shaft moves outwardly from engagement with the engine shaft because of the action of the cam on the end of the pin 18. Before the starting shaft can be forced toward the engine shaft to engage the same, it is necessary that the narrow portion of the cam be opposite the end of the pin 18, for otherwise the cam would engage said pin and not allow a sufficient longitudinal movement of the starting shaft.

My improvement resides in a means for holding the starting shaft positively against rotational movement, while the operating member 15 is being rotated, so as to bring the pin 18 opposite the proper portion of the cam. In accomplishing this object I provide the inner wall (5 and easing 5 with notches 21. which open upon the hole 9 at diametrically opposite points thereof. A pin 22 is carried by the starting shaft 2 and is adapted to have its extremities seat within the notches, at which time the starting shaft is, of course, locked against rotational movement, since the casing 5 is stationary. The expansive spiral spring 23 bears at its inner end against the vehicle frame, not shown, and at its outer end against a washer 24c. The tendency of this spring is to hold the starting shaft away from engagement with the engine shaft. It will be seen that when the extremities of the pin 22 are within the notches 21, that the operating member may be rotated so as to bring the pin 18 oppo site the proper portion of the cam. Then this has been done the operating member can be pushed inwardly so as to carry with it the starting shaft 21, bringing the latter into engagement with the engine shaft and bringing the pin 22 from out of the notches 21.

In Figs. 3 and 4: I have shown a stationary casing 25, which is identical in construction with the casing, shown in my previous application, the inner wall 26 of said casing being formed with a central opening 27 through which the hub 12 of the ratchet wheel 11, projects. When this form of casing is used, I provide a stop arm 28 in the form of a metal bar or strip. This bar is secured to the wall 26 by means of suitable fasteners 29, and is adapted to be engaged by the pin 22, to hold the starting shaft 2 against rotation when the parts of the device are being positioned preparatory to beginning the cranking operation.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that I have provided a simple and efficient means for holding the starting shaft 2 against rotation relative to the operating member 15, and it is to be understood that while I have shown and described the preferred embodiment of my invention, that minor changes in construction, combination and arrangement of parts may be made without departing from the scope and spirit of the invention as claimed.

Having thus described my invention, I claim 1. In a cranking device for internal combustion engines, the combination of a starting shaft mounted for rotational and 1011- gitudinal movement, a cam rigidly secured at one end of said starting shaft, an operating member rotatable upon the starting shaft, means whereby a movement of the operating member may be imparted to the starting shaft, a pin carried by the operating member for engagement by said cam; and means for locking the starting shaft when in its outermost position against rotation with the operating member.

2. In a cranking device of the character described, a starting shaft mounted for rotational and longitudinal movement, an operating member rotatable upon the starting shaft, means whereby movement of the operating member may be imparted to the starting shaft, a cam rigid with the starting shaft, means carried by the operating member for engagement with said cam, a ratchet wheel mounted upon said starting shaft, a pawl cooperating with said ratchet, said cam engaging means rigidly secured to said ratchet wheel, a stationary member through which the starting shaft extends, said stationary member being formed with notches; and a pin carried by the starting shaft for engagement in said notches, whereby the starting shaft is held against rotational movement.

3. In acranking device for internal combustion engines, a starting shaft mounted for rotational and longitudinal movement, an engine shaft arranged to cooperate with said starting shaft, a stationary casing through which the starting shaft projects, a lateral projection carried rigidly on the starting shaft, the casing being provided with means to engage said projection and hold it stationary when the starting shaft is in its outermost position, and means for holding said starting shaft normally in its outermost position out of engagement with the engine shaft.

In testimony whereof I afliX my signature in presence of two witnesses.

CHARLES A. BARTLOG.

Witnesses:

EDWARD G. BARTLOG, Jos. A. SMRZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

